GNU bug report logs - #34174
27.0.50; Calling `par' via shell-command-on-region always errors out

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Kaushal Modi <kaushal.modi <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#34174: closed (27.0.50; Calling `par' via shell-command-on-region
 always errors out)
Date: Tue, 29 Jan 2019 02:30:02 +0000

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Your message dated Mon, 28 Jan 2019 21:29:03 -0500
with message-id <CAFyQvY0vDoAR+6CS5vFRdXYaFN_4cgUSHVB8vWLJrjoDxVqNDw <at> mail.gmail.com>
and subject line Re: 27.0.50; Calling `par' via shell-command-on-region always errors out
has caused the debbugs.gnu.org bug report #34174,
regarding 27.0.50; Calling `par' via shell-command-on-region always errors out
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
34174: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34174
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Kaushal Modi <kaushal.modi <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org, Tom Tromey <tom <at> tromey.com>
Subject: 27.0.50; Calling `par' via shell-command-on-region always errors out
Date: Tue, 22 Jan 2019 17:27:29 -0500

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Hello,

I have found a regression in the behavior of shell-command-on-region,
though specifically for a third party binary `par'. par can be obtained
from http://www.nicemice.net/par/.

How to reproduce the error:

1. Install par and put it in PATH (sorry, I cannot reproduce this error
with any other utility).
2. Open emacs -Q.
3. Select the two lines that show up by default in the scratch buffer: ";;
This buffer is for text that is not saved, and for Lisp evaluation.
;; To create a file, visit it with C-x C-f and enter text in its buffer.
".
4. Call `M-| par'.

You will get this error on emacs master emacs -Q , but *not* on emacs 26.1:

===
ERROR in parse_header: buffer was ';; This buffer is for te'
error: client: reader got error Success
===

What's surprising is that I have selected the whole 2 lines to be sent to
par, but the error from par says:

    buffer was ';; This buffer is for te'

I cannot reproduce this error on 26.1.


I looked at the git revision history that affected shell-command-on-region
that affected in recent times, but I couldn't find any.

But I do see
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=d1ec3a0a8e4d7d56ebc1e4fa743130b9974ac6a8
affecting callproc.c/call-process-region.

Can you please review if that change could have caused this regression?

Thanks.

In GNU Emacs 27.0.50 (build 11, x86_64-pc-linux-gnu, GTK+ Version 2.24.23)
 of 2019-01-22
Repository revision: 9eaf5e052a802a7b0560f983f2bb786e13ce2488
Repository branch: master
Windowing system distributor 'Open Text', version 11.0.11505
System Description: Red Hat Enterprise Linux Workstation release 6.8
(Santiago)

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Mark set
ERROR in parse_header: buffer was ';; This buffer is for te'
error: client: reader got error Success

Configured using:
 'configure --with-modules
 --prefix=/home/kmodi/usr_local/apps/6/emacs/master
 '--program-transform-name=s/^ctags$/ctags_emacs/' --with-harfbuzz
 --with-dumping=unexec 'CPPFLAGS=-I/home/kmodi/stowed/include
 -I/home/kmodi/usr_local/6/include -I/usr/include/freetype2
 -I/usr/include' 'CFLAGS=-O2 -march=native'
 'LDFLAGS=-L/home/kmodi/stowed/lib -L/home/kmodi/stowed/lib64
 -L/home/kmodi/usr_local/6/lib -L/home/kmodi/usr_local/6/lib64''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF
XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11 XDBE XIM MODULES THREADS GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
easymenu mml-sec password-cache epa derived epg epg-config gnus-util
rmail rmail-loaddefs time-date mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils shell pcomplete
comint ansi-color ring elec-pair mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 101350 8692)
 (symbols 48 20712 1)
 (strings 32 30382 2230)
 (string-bytes 1 841942)
 (vectors 16 15780)
 (vector-slots 8 517527 12352)
 (floats 8 43 74)
 (intervals 56 255 0)
 (buffers 992 12)
 (heap 1024 25874 879))


--
Kaushal Modi

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From: Kaushal Modi <kaushal.modi <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>, 34174-done <at> debbugs.gnu.org
Subject: Re: 27.0.50;
 Calling `par' via shell-command-on-region always errors out
Date: Mon, 28 Jan 2019 21:29:03 -0500

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On Wed, Jan 23, 2019 at 1:05 PM Paul Eggert <eggert <at> cs.ucla.edu> wrote:

> On 1/23/19 9:37 AM, Kaushal Modi wrote:
> > I ran:
> >
> > strace -o /tmp/par.tr <http://par.tr> par, and
> > strace -o /tmp/emacs.tr <http://emacs.tr> emacs -Q
> >
> > Looking at the .tr files, they could possibly contain work sensitive
> > data. So I am not sure if I should share those files publicly.
>
> We care about the I/O requests involving the text you're reformatting,
> so I suggest running 'par' on some innocuous text and just looking at
> the associated syscalls (assuming you can reproduce the problem).
>
> Also, please try running the shell command 'fmt' on the same text, to
> see if that can reproduce the problem. If it doesn't reproduce the
> problem, see how fmt's system calls differ from par's. I mention 'fmt'
> because it's similar to 'par' and I can easily run 'fmt' here.
>


Hi Paul,

Thanks for your time. I hate it when this happens.

This issue got automagically "solved". I cannot recreate this issue any
more.
All I did was rebuild Emacs to the latest master.

[ As I did not understand the root cause of this issue, I am certain that
this will repeat at some point. ]

Kaushal

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